Malicious PDF — malware analysis report

Static analysis result for SHA-256 023de8a2de11f907…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 02:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9cde50e3e36ae6b1eb195bcca070528 SHA-1: 4f169954029ff001c244595ab15a5a8c09724a39 SHA-256: 023de8a2de11f907a897ed768789bc8c645371d061c8920cd2a19058f24e183b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings point to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mimpishiodua.com/contents//files/badeposofepuxuketiril.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0a772ae6---31889706260.pdf
    • http://tamker.hu/userfiles/file/56125675931.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/pemomaladanajovidoripod.pdf
    • http://seyrimerdin.com/userfiles/file/virazaxev.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f428946d07b233d945e0a95570906eaa/debaralisuzetu.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805bdae1291---47200608240.pdf
    • http://sisparts.pl/zdjecia/fck/file/gemelorifatozanidamuj.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/08dfb5f1c1dd5c15392401230e9157e3/gefitudukebominasaviwu.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e116c860fefa0821b031b393d5673994/wamozotazem.pdf
    • https://hondamienbac.vn/userfiles/file/kukapuvunujinar.pdf
    • http://zatexpress.com//upload/userfiles/files/buwezibawapub.pdf
    • http://ambvet-trefontane.eu/userfiles/files/dozopokov.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90cd002396b40690de971c5c846ce18e/joniximi.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaacdb8550f---98682350391.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071debf4ba47---18326822997.pdf
    • http://hoacanh.net/luutru/files/79789818281.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16077852089a0b---43389592227.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ffvdi2cvps5hckpjjkum770i6/66801023035.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad10d3b4cd9---10398953868.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e84604a3---vibelazis.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087695b873e5---36766088154.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=part+of+the+circumference+of+a+circle+is+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda7.bin
dd28548061f10dd4c6702763ac064c9bc915af596d7491f70265b0e363e465ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 10844 bytes
font_01_sfnt_off0000e679.bin
e61f8c0eb67c9e71c87252800e26ffe8970dbfabab325228be8d627d158f65a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 16540 bytes
font_02_sfnt_off00011193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes